There is a particular type of cut-out illuminated foliate initial which is found in many institutions, and of which examples appear on the market with some regularity. Once you have seen a few they are very easy to recognise, because although one may differ from another in their type of foliage, their formal and technical features are very consistent. The image above has been chosen to give a sense of their overall uniformity as well as variety of foliage-types (click the image to enlarge). Over the course of a couple of posts I intend to look at this large group of initials (I know of more than 200 of them [1]), and consider some questions they raise.
In 1994 Christopher de Hamel suggested that the initials came from the same manuscript as the well-known historiated initials cut from the Murano Gradual; he based this partly on details of their illuminated ornament, but mainly on the script of the text and music on their backs[2], and since then, they have regularly been described as having come from the Murano Gradual. The question of the parent volume has been addressed very recently. In 2019 Bryan C. Keene and Stephanie Azzarello offered some observations both for and against accepting de Hamel's proposal, but left the question open: 'further analysis of this entire group of illuminations is in order and will be part of a longer study'. In a recent article, having had the opportunity for further analysis, they concluded that "[the initials'] association with the Murano manuscripts does not seem likely", and pointing to evidence that "aids in disassociating De Hamel’s group of initials from the Murano series".